Have Toyota Questions? Ask a Mechanic for Answers ASAP
Hello and welcome to Just Answer my name is***** the light comes on it means vehicle detected a problem and stored a related diagnostic code in computer. If vehicle still runs fine that usually means problem is emission related such as leaking fuel cap, leaking filler neck, ect. You can have codes checked at your local auto parts store for free and reply back to me if you want to try and fix yourself.